A ball weighing 3 kg moves at a speed of 5 m / s towards a ball weighing 4 kg moving
| December 26, 2020 | education
A ball weighing 3 kg moves at a speed of 5 m / s towards a ball weighing 4 kg moving at a speed of 3 m / s. How fast will the balls move together?
We use the law of conservation of momenta:
mU (2) + MU (2) = (m + M) U (3)
Substitute values
5 * 3-3 * 4 = 7 * U (3)
3 = 7 * U (3)
U (3) = 3/7
Answer: 3/7
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